package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import com.sky.utils.WeChatPayUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WeChatProperties weChatProperties;
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    @Override
    public User longin(UserLoginDTO userLoginDTO) {
        //调用微信接口服务，获得当前微信用户的openid------这里把调用的逻辑抽取成了方法
        String openid = getWxOpenid(userLoginDTO.getCode());

        //判断openid是否为空，如果为空表示登陆失败，抛出业务异常

        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断当前用户是否为新用户
        User user = userMapper.getByOpenid(openid);
        if(user == null){
            //如果是新用户，自动完成注册
           user = User.builder().openid(openid).createTime(LocalDateTime.now()).build();
           userMapper.insert(user);
        }
        //返回这个用户对象
        return user;
    }

    /**
     * 调用微信接口，获取openid 的方法
     * @param code
     * @return
     */
    private String getWxOpenid(String code){
        Map<String,String> paramMap = new HashMap<>();
        paramMap.put("appid",weChatProperties.getAppid() );
        paramMap.put("secret",weChatProperties.getSecret() );
        paramMap.put("js_code",code );
        paramMap.put("grant_type","authorization_code" );
        //获得的openid是一个json格式的字符串
        String json = HttpClientUtil.doGet(WX_LOGIN, paramMap);

        //将获得的json格式的字符串 提取出openid
        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
